linux-kernel - Re: pci-express hotplug

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Date:	Mon, 12 Oct 2009 17:06:04 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Mark Lord <lkml@....ca>
Cc:	Greg KH <greg@...ah.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	jbarnes@...tuousgeek.org, linux-pci@...r.kernel.org
Subject: Re: pci-express hotplug

On Mon, Oct 12 2009, Mark Lord wrote:
> Jens Axboe wrote:
>> On Mon, Oct 12 2009, Greg KH wrote:
>>> On Mon, Oct 12, 2009 at 02:06:20PM +0200, Jens Axboe wrote:
>>>> Hi,
>>>>
>>>> I'm trying to get pci-express hotplug working in a box here. I don't
>>>> really care about the hotplug aspect, I just want the darn pci-e slots
>>>> that are designated hotplug slots to actually WORK. When I load pciehp,
>>>> I get:
>>>>
>>>> Firmware did not grant requested _OSC control
>>>> Firmware did not grant requested _OSC control
>>>> Firmware did not grant requested _OSC control
>>>> Firmware did not grant requested _OSC control
>>>> pciehp 0000:00:05.0:pcie04: HPC vendor_id 8086 device_id 340c ss_vid 0 ss_did 0
>>>> pciehp 0000:00:05.0:pcie04: service driver pciehp loaded
>>>> Firmware did not grant requested _OSC control
>>>> pciehp 0000:00:07.0:pcie04: HPC vendor_id 8086 device_id 340e ss_vid 0 ss_did 0
>>>> pciehp 0000:00:07.0:pcie04: service driver pciehp loaded
>>>> Firmware did not grant requested _OSC control
>>>> pciehp 0000:80:07.0:pcie04: HPC vendor_id 8086 device_id 340e ss_vid 0 ss_did 0
>>>> pciehp 0000:80:07.0:pcie04: service driver pciehp loaded
>>>> pciehp 0000:80:09.0:pcie04: HPC vendor_id 8086 device_id 3410 ss_vid 0 ss_did 0
>>>> pciehp 0000:80:09.0:pcie04: service driver pciehp loaded
>>>> pciehp: PCI Express Hot Plug Controller Driver version: 0.4
>>>>
>>>> and the devices in the hotplug slots stay off. Is this an ACPI/bios
>>>> issue? How can I debug this?
>>> Can you try the acpiphp driver instead?  That's usually the driver you
>>> want to use for "modern" systems (i.e. anything made in the past 5
>>> years.)
>>
>> I should have mentioned that I tried that too. It doesn't complain, but
>> I don't see my cards anywhere afterwards. I'm a hotplug newbie, do I
>> need to do anything else?
>
> Tried this yet:
>
>   options pciehp pciehp_force=1

Nope, but it does find and register the hotplug slots, so I didn't think
it would make a difference. The _OSC is there.

I'll try tonight, just in case.

-- 
Jens Axboe

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